If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You may have to register
before you can post: click the register link above to proceed. To start viewing messages,
select the forum that you want to visit from the selection below.

basically, i skip most steps. installed CPU, stick of ram(works with old mobo), video card, cooler. i connected power to mobo, power to cpu power to cooler power to vga and stick of ram into different slots, case vintilator.
with new cpu and mobo no signs of life whatsoever. no spinning of cpu fan, no fan from case or video card. i take jumer from bious out. no rection.(i dont have power button connected yet)
i connect psu to old mobo, take out bios jumper it just works(R). old gpu and cpu start, i connecct hdd and monitor and boot old PC

Any suggestions?
it appears new mobo is not backward compatible with old CPU, as expected. afaik new CPU phiscially should be compatible with old mobo, whichi am going to try tonight.

any other suggestions? should i not try 8 core CPU on older mobo?

i got 8 pin power for CPU and 24 pin for mobo. mobo documentation explicetly says that 4 pin should also do.

I don't understand anything your wrote.
What hardware did you have.
What hardware did you buy.
What parts did you assemble, how, what is reaction.
What parts did you reassemble, how, what is reaction.

First, you can't insert AM3+ CPU into AM3, AM2+ or AM2 motherboard. This is because AM3+ CPU needs more power (140W+) and previous sockets can only provide 120W.
AM3+ socket is black and the CPU pins are larger. You physically can't insert it.

Insert old CPU into new mainboard. Ensure that there are no damaged pins. Make sure, if there is BIOS reset jumper, that it is correct position (ie OFF).
The fact that motherboard does not react at all, is power problem or very dangerous short circuit, which motherboard logic detected and refuse to power on.
In the last problem, the motherboard usually does give short power (fans rotate just a bit) but does not power at all.

It could also be that BIOS is set default to CPU cooler auto power off, and the motherboard will not start if CPU cooler does not give the tacho signal.

With absent memory it should do "peep-peep-peeeep", this is when you correctly insert memory, videocard and attach 12v cables+monitor and try to boot.
If the board does not power on from this configuration, it is probably physically defect or your PSU is incorrectly working or connected; since working motherboard can even detect faulty CPU.
So, make sure you have speakers always connected, unless you use motherboard with LED error signal.

NP, so it was faulty CPU? Thanks for info, probably the CPU was producing short-circuit...? I remember being able to flash BIOS even on crippled Athlon Palomino core in old K7 days, so motherboards nowadays detect a variety of even weirdest troubles. Happy you solved it!

Comment

NP, so it was faulty CPU? Thanks for info, probably the CPU was producing short-circuit...? I remember being able to flash BIOS even on crippled Athlon Palomino core in old K7 days, so motherboards nowadays detect a variety of even weirdest troubles. Happy you solved it!

I have got your message before I send my new Mobo back.
Ou well, thanks for reply anyway!